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Method for injecting fuel

a fuel injection and engine technology, applied in the direction of electrical control, process and machine control, instruments, etc., can solve the problems of fueling errors, waste of fuel, and excessive fuel in the cylinder, so as to improve fuel economy, reduce emissions, and optimize the air/fuel ratio

Active Publication Date: 2014-09-16
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach improves fuel economy and reduces emissions by accurately adjusting fuel injection amounts based on real-time intake conditions, compensating for fuel vapors and other sources, thereby optimizing air / fuel ratios.

Problems solved by technology

Fueling errors may occur, however, during operating conditions where fuel vapors are present in the intake.
For example, fuel vapor canisters designed to trap fuel vapors from the fuel tank are periodically purged to the intake, and these vapors may result in an excess amount of fuel in the cylinders, wasting fuel and degrading emissions.
However, these estimates are frequently inaccurate.
Further, these estimates don't take into account additional sources of intake fuel, such as fuel from the positive crankcase ventilation system or pushback fuel.

Method used

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Examples

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Embodiment Construction

[0013]An oxygen sensor positioned in the intake of an engine may be able to provide information regarding various parameters of the intake air, including ambient humidity, EGR, and fuel vapor amounts in the intake. Under some conditions, the reading from the intake oxygen sensor may be directly used to determine one or more of the above parameters. In other conditions, the intake oxygen amount may be determined and the relative contribution of the above parameters to the intake oxygen concentration may be modeled. Together, this information may be used to maintain the air / fuel ratio in each cylinder at an optimal level to improve fuel economy and reduce emissions. FIG. 1 is an example engine system including a controller, an intake oxygen sensor, and various sources of intake fuel vapors, such as a fuel tank vapor recovery system. FIG. 2 is a single cylinder diagram of the engine of FIG. 1. FIGS. 3 and 4A-4C are example control routines that may be carried out by the controller of F...

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PUM

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Abstract

Embodiments for adjusting fuel injection are provided. In one example, a method comprises adjusting fuel injection based on fuel concentration in an engine intake manifold, and during idle and when EGR is disabled, adjusting fuel injection based on the fuel concentration and a fuel pushback amount. In this way, fuel injection may be adjusted based on fuel concentration in the intake manifold.

Description

FIELD[0001]The present disclosure relates to fuel injection in an engine.BACKGROUND AND SUMMARY[0002]Fuel injection amounts are typically set based on a desired air / fuel ratio and adapted using feedback from one or more exhaust gas sensors in the exhaust. Fueling errors may occur, however, during operating conditions where fuel vapors are present in the intake. For example, fuel vapor canisters designed to trap fuel vapors from the fuel tank are periodically purged to the intake, and these vapors may result in an excess amount of fuel in the cylinders, wasting fuel and degrading emissions.[0003]Previous solutions to account for the amount of fuel originating from the fuel vapor canister have relied on purge flow estimates, based on purge duration and other parameters. However, these estimates are frequently inaccurate. Further, these estimates don't take into account additional sources of intake fuel, such as fuel from the positive crankcase ventilation system or pushback fuel.[0004...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F02D41/30F02D41/00F02D41/14
CPCF02D41/144F02D41/0042F02D41/08F02D2041/1472
Inventor SURNILLA, GOPICHANDRASOLTIS, RICHARD E.KERNS, JAMES MICHAELSMITH, STEPHEN B.MAKKI, IMAD HASSAN
Owner FORD GLOBAL TECH LLC